Holographic optical element
US7675631B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 27, 2007 |
| Grant date | Mar 9, 2010 |
| Priority date | — |
| Expiry date | Feb 20, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/32
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of measuring a dimension and/or position of an object located in a measuring field, includes projecting a fan-shaped reference wave onto a holographic optical element having a first interference pattern and a second interference pattern; forming a first parallel partial wave front from the fan-shaped reference wave using the first interference pattern, the first parallel partial wave front entering the measuring field; and forming a second parallel partial wave front from the fan-shaped reference wave using the second interference pattern, the second parallel partial wave front entering the measuring field; wherein the measuring field is located behind the holographic optical element, and the first parallel partial wave front and the second parallel partial wave front intersect in the measuring field. A method of making a holographic optical element is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.